I have a 2015 Ram with the ecodiesel, and changed my oil, and when I pulled the oil filter and went to put the new one in, there was a spring and what looks like a check valve of some type laying in the bottom on the housing. After looking around online, can not find the part or figure out what it does. There is a hole on the firewall side inside where the filter goes, which appears to be where it goes. Does anyone know what this part could be for, and how important it is. Also if can find it anywhere, or have to replace the entire Oil Cooler/Filter housing?